[PATCH v4] add support for Mediatek Command-Queue DMA controller on MT6765 SoC

[shun-chih.yu]

Changes since v3:
- simplify the ISR and management on descriptors by removing tasklet and ASYNC_TX_ENABLE_CHANNEL_SWITCH
- remove useless field in mtk_cqdma_vdesc structure
- change dev_info to dev_dbg
- fix typos

Changes since v2:
- fix build warning for kernel with DMA address in 32-bit

Changes since v1:
- remove unused macros, typos
- leverage ASYNC_TX_ENABLE_CHANNEL_SWITCH to maintain DMA descriptor list


Shun-Chih Yu (2):
  dt-bindings: dmaengine: Add MediaTek Command-Queue DMA controller
    bindings
  dmaengine: mediatek: Add MediaTek Command-Queue DMA controller for
    MT6765 SoC

 .../devicetree/bindings/dma/mtk-cqdma.txt     |  31 +
 drivers/dma/mediatek/Kconfig                  |  12 +
 drivers/dma/mediatek/Makefile                 |   1 +
 drivers/dma/mediatek/mtk-cqdma.c              | 867 ++++++++++++++++++
 4 files changed, 911 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/mtk-cqdma.txt
 create mode 100644 drivers/dma/mediatek/mtk-cqdma.c